Gamma Ray Burst Beaming Constraints from Afterglow Light Curves: GRB 970508

Details Gamma Ray Burst Beaming Constraints from Afterglow Light Curves: GRB 970508 Gamma Ray Burst Beaming Constraints from Afterglow Light Curves: GRB 970508

1999-03-25

arxiv.org/abs/astro-ph/9903400v1

Astron.Astrophys.Suppl.Ser. 138 (1999) 539

Astronomy and Astrophysics

Astrophysics

2 pages, one embedded postscript figure. To appear in Astronomy and Astrophysics Supplement series (Rome conference proceeding

Scientific paper

10.1051/aas:1999343

The beaming angle (zeta) is the main uncertainty in gamma ray burst energy
requirements today. We summarize predictions for the light curves of beamed
bursts, and model the R band light curve of GRB 970508 to derive zeta > 30
degrees. This yields an irreducible minimum energy requirement of 3.4 times
10^{49} ergs to power the afterglow alone.

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